Updating error message in xproto

Change-Id: I21ff9746e61f83d83c7cc64c452913d1299b49f9
diff --git a/lib/xos-genx/xosgenx/targets/django-split.xtarget b/lib/xos-genx/xosgenx/targets/django-split.xtarget
index 60cf9de..200a29f 100644
--- a/lib/xos-genx/xosgenx/targets/django-split.xtarget
+++ b/lib/xos-genx/xosgenx/targets/django-split.xtarget
@@ -38,7 +38,7 @@
   {%- endfor %}
 
   # Meta
-  {%- set uniques = xproto_field_graph_components(m.fields) %}
+  {%- set uniques = xproto_field_graph_components(m.fields, m) %}
   {%- if uniques %}
   class Meta:
       unique_together = {{ xproto_tuplify(uniques) }}